What occurs when an object travels in a curved path?

An object following any type of curved motion will necessarily be changing its direction as it moves. This change in direction constitutes a change in velocity, since velocity is a vector, and, thus, velocity has both a size, the speed, and a direction. So, if an object travels in a curved path, it changes velocity, and, thus, accelerates. This acceleration must be tied to a force. Newton's laws of motion explain this. Therefore, whenever an object travels in a curved path, there must be an unbalanced force acting upon it.

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